Coupling-nipple



J. C. SMITH.

CUUPLING NIPPLE.

APPLICATION FILED AuG.2B. 1919.

Pmnted July 19 UNITED @STATES JAMES c. SMITH, or runen, oxLAHom'A.

GOUPLING-NIPPLE.

Specicaticn of Letters Patent. Patented July 19, 1921.V

Application mea August 2s, 191s. Senn No. 320,383.

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Be it known that I, JAMES C. SMITH,

citizen of vthe United. States, residing at Tulsa, in the county of Tulsa and State of Oklahoma, have'invented certain newand useful Improvements in Coupling-Nipples, of which the following is a specification.

This invention relates to an improved coupling nipple fon deep well casings.

It sometimes happens when pulling a casing that, owing to severe strain, adjacent will separate at the joint therebetween. n some instances, the upper section becomes disengaged from 'the joinlt` collar while in other instances the oint collar becomes, disengaged from the lower section. The present invention, therefore, has as one of its principal 'objects to `provide a coupling nipple which may be connected to the upper section and used in either of the contingencies 'mentioned for j again connecting the upper section to the j a casing joint collar.

lower section whereby the pulling operation ofthe casing may be completed.

The invention has as a further object, as may be perceived from the foregoing object, to provide a coupling nipple which willjbe double ended, one end being internally threaded for engagement around a casing section and the other end being reduced and externally threaded for engagement within When the casing sections separate as c above stated, the threads of the casing section and of the joint collar are 4generally mashed and distorted or otherwisemutilated and a further object of the invention is to provide a coupling nipple, the threads of which will be 'so formed that they will plow their .way between the 'threads of a 'casingk section or joint collar.

vAnd the invention has as a still further object to provide a couplingnipple equipped with centeri means adapted to coact with a casing section whereby the free endof said section may be brought into re"'ster with the nipple for engagement there y.

Other and incidental objects will appear hereinafter. v

In the drawings:

Figure 1 is a vertical sectional view show-y in my improved coupling ni ple in use wigth its smaller end presented dbwnwardly, Fig. 2 is a view similar to Fig. 1, but

showing the nipple with its larger end pre-' sented downwardly,

Figs. 3 and 4 are side-elevations illustratlng the use of the centering lugs upon the nipple, and

Fig. 5 is a transverse sectional view taken on the line 5 5 of Fig. 4: and looking in the direction of the arrows. f

In carrying the invention into eii'ect, I employ a double ended nipple having an end portlon 1() of one diameter and an end portion 1 1 of a somewhat larger diameter, the coupling being preferably'drop forged. The end portion 10 is externally threaded for engagement within a casing joint collar and said threads are interrupted by`a plurality of transverse channels 12 whereby the ends of these threads at the channels will be adapted to act as cutters and plow between the threads of the casing joint col-` end portion of the nipple 'at its inner side is an arcuate centering lug 14 conforming 1n its transverse curvature to the curvature of said end portion. The larger end portion 11 of the nipple iS provided with a simi-V lar centering lu 15 which extends longitudinally from tie end'edge of this latter end portion and in its transverse curvature conforms thereto. vvThe lug 14 is somewhat longer than the lug 15 and is arranged with its outer face lying flush with the inner face of the end portion 10-l On the other hand, the lug 15, being extended from the end edge of the end portion 11, is arranged with its inner face substantially flush with the inner Vface of this latter end portion.

In Fig. 1 I have shown my improved coupling nipple in use in connectlon with a lower casing section 16 andan upper casing section 17 the lower section carrying a joint collaro18, it being assumed that the up er section has been pulled out of said col ar. For coupling the sections, my improved nipple is first threaded at its larger end `around the adjacent end of the section 17 of the casing when this casing section with the 4nipple thereon is lowered into the well and rotated to engage the smaller end ortion of the nipple within the collar 18. T e pulling 2 I I* operation pleted.

ofthe casingmayfthen be com- In Fig. 2, I have shown the useof' the nipple in connectionnwith .a lower casing section 19, up er casing section 20, and joint collar 21 carrled by the upper section, it be.

tion is lowered and larger end portion ofthe nipple around the casing tate about a vertical-axis,

section 19. The pulllng operation of the casing may 'thenbe completed.

In Figs. -3- and 4, I 4have illustrated the' use of the centering lugs upon the nipple.

f It sometimes happens that the upper end of the lower casing section-will lean toward one side of the well, making it necessary to bring this lower casing section into alinement with the upper casing section before .the nipple can be engaged with the `lower casing section. In AFig. 3, the lower casing section 16 is shown as leaning to oneside. In this event, theupper casing section is lowered until the smaller end portion 10 of the-'nipple abuts the collar 18 when the centeringlug' 14 will projectwithin the' lower casing section in position-to coact with the inner face vthereo Consequently, ,by` then supporting the upper casin section to rot e lug 14 will., when the upper casing section is turned, ride around the Inner `face ofthe lower casing section 'at its upper end forv swinging the lower casing section into alinement with the upper section, when continued turning of the upper section will serve ltojenga'ge the end portion 10v of the nipple within the collar. When the nipple is reversed end for end as'shown in Fig. 2, the centering lug 15 f will be adapted to ride around the outery` face of the lower casing 'section in a manner l i l similar to that just -described in connection with-the lug 14 for centering the lower cas-` ing section 19. with respect to the upper cas- 1ng section 20. In this connection 1t is to be' particularly observed, as brought out in' .Fi

i f 5, that 'since the lug- 14 is transversal? what is claimed as new vchannels transverse to the e. ing its outer face flush with the brought into use, be adapted to seat iat against the outer face of the lower casin section to likewise sectioii. It will accordingly be seen that I provide a kvery effective type ofcoupling n1 e.

aving thus described the invention,

1s: f y 1. A coupling nipple of the character dc- .scribed comprising a double ended nipple body internally threaded at one end and exteriorly threaded at its opposite end, the threaded portions being interrupted by threads. 2. A coupling nipple of the character described includmg a\ double ended nipple body provided ateach tering means, the centering means at one .end of the body being adapted to engage the inner surface of a joint-collar and the centering means at the opposite end of the body f being adapted to engage the outer surface of a tube section.

prevent teetering of sai end thereof with cen' 3. A coupling nipple of the character described, including a double ended nipple body having centering 'lugs projecting ontn idinally from the ends thereof, the body ing internally threaded at one end and exteriorly threaded at its opposite end and the threaded portions being interrupted by channels transverse tothe threads.. l

4. Acoupling nipple of the character described includmg a double ended nipple body having its end portions of different diameters, and centerlng lugs projecting longitudinallyf from the endsof the lug"` at the smallerend of the body havinner face of the body and the lug at the larger end of the body'havin its inner face flush with the inner face of t e body.

Intestimon whereof I aiiix m si ature."

. JYAMES c, SM1 ai. iria] the body, 

